Kiwis caught in suspected mass methanol poisoning in Laos are returning to New Zealand

It can also be accidentally generated during brewing.

The Ministry of Foreign Affairs and Trade (MFAT) previously said a New Zealander was believed to be among the poisoning victims.

Today a spokeswoman confirmed that the tourist had been able to return to New Zealand.

“The New Zealand Embassy in Bangkok (which is responsible for Laos) has provided assistance to a New Zealander who we believe was poisoned with methanol in Laos,” she said.

“They have now left Laos and returned home.”

Mfat has updated its travel advice for Laos to report that there have been several cases of suspected methanol poisoning after consuming alcoholic beverages.

“Travelers are advised to exercise caution when consuming alcoholic beverages, especially cocktails and drinks made with spirits that may be adulterated with harmful substances. Know the signs of methanol poisoning and seek immediate medical attention if poisoning is suspected.”

It is understood the owner of the Nana Backpacker Hostel where the two friends were staying was arrested for questioning by police in Laos on Friday, the ABC said.

The two Australian victims are said to have started their evening with free drinks at the hostel before heading to other bars.

The ABC reports that the hostel previously claimed the drinks in question did not come from the bar.

What does methanol poisoning do?

Victims can develop severe metabolic acidosis, when too much acid builds up in the body.

Symptoms include nausea, vomiting and abdominal pain, as well as central nervous system depression. This can cause people to become unconscious and possibly into a coma.

Methanol poisoning can also cause damage to the retina, leading to vision loss.

Treatment includes supportive care such as intubation and ventilation to help the patient breathe, and some medical care may be provided to remove methanol from the body.

Melissa Nightingale is a Wellington-based reporter covering crime, justice and news in the capital. She joined the Herald in 2016 and worked as a journalist for ten years.